When you enable remoteapps to run using Microsoft’s Remote Desktop Services, it is usually desirable to prevent users to logon into their Remote Desktops. A workaround of this issue is to terminate the Remote Desktop session when someone tries to login. To accomplish this, run the “Remote Desktop Session Host Configuration” application, select and right click the properties of the RDP-Tcp connection name.
Then go to Environment tab and select the “Start the following program when the user logs on:” bullet, finally type in the path of logoff.exe file, c:\windows\system32\logoff.exe.
Now, try to connect by Remote Desktop Connection to your RDS server.